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Problem: vim_strnchr() is strange and unnecessary (after v9.1.1009)
Solution: Remove vim_strnchr() and use memchr() instead. Also remove a
comment referencing an #if that is no longer present.
vim_strnchr() is strange in several ways:
- It's named like vim_strchr(), but unlike vim_strchr() it doesn't
support finding a multibyte char.
- Its logic is similar to vim_strbyte(), but unlike vim_strbyte() it
uses char instead of char_u.
- It takes a pointer as its size argument, which isn't convenient for
all its callers.
- It allows embedded NULs, unlike other "strn*" functions which stop
when encountering a NUL byte.
In comparison, memchr() also allows embedded NULs, and it converts bytes
in the string to (unsigned char).
closes: vim/vim#16579
https://github.com/vim/vim/commit/34e1e8de91ff4a8922d454e3147ea425784aa0a0
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Problem: diff feature can be improved
Solution: include the linematch diff alignment algorithm
(Jonathon)
closes: vim/vim#9661
https://github.com/vim/vim/commit/7c7a4e6d1ad50d5b25b42aa2d5a33a8d04a4cc8a
Co-authored-by: Jonathon <jonathonwhite@protonmail.com>
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completing (#32251)
Problem: Vim doesn't highlight to be inserted text when completing
Solution: Add support for the "preinsert" 'completeopt' value
(glepnir)
Support automatically inserting the currently selected candidate word
that does not belong to the latter part of the leader.
fixes: vim/vim#3433
closes: vim/vim#16403
https://github.com/vim/vim/commit/edd4ac3e895ce16034c7e098f1d68e0155d97886
Co-authored-by: glepnir <glephunter@gmail.com>
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Problem: Adding support for modern Nvim features (reflow, OSC 8, full
utf8/emoji support) requires coupling libvterm to Nvim internals
(e.g., utf8proc).
Solution: Vendor libvterm at v0.3.3.
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case-insensitive
Problem: regex: wrong match when searching multi-byte char
case-insensitive (diffsetter)
Solution: Apply proper case-folding for characters and search-string
This patch does the following 4 things:
1) When the regexp engine compares two utf-8 codepoints case
insensitive it may match an adjacent character, because it assumes
it can step over as many bytes as the pattern contains.
This however is not necessarily true because of case-folding, a
multi-byte UTF-8 character can be considered equal to some
single-byte value.
Let's consider the pattern 'ſ' and the string 's'. When comparing and
ignoring case, the single character 's' matches, and since it matches
Vim will try to step over the match (by the amount of bytes of the
pattern), assuming that since it matches, the length of both strings is
the same.
However in that case, it should only step over the single byte value
's' by 1 byte and try to start matching after it again. So for the
backtracking engine we need to ensure:
* we try to match the correct length for the pattern and the text
* in case of a match, we step over it correctly
There is one tricky thing for the backtracing engine. We also need to
calculate correctly the number of bytes to compare the 2 different
utf-8 strings s1 and s2. So we will count the number of characters in
s1 that the byte len specified. Then we count the number of bytes to
step over the same number of characters in string s2 and then we can
correctly compare the 2 utf-8 strings.
2) A similar thing can happen for the NFA engine, when skipping to the
next character to test for a match. We are skipping over the regstart
pointer, however we do not consider the case that because of
case-folding we may need to adjust the number of bytes to skip over.
So this needs to be adjusted in find_match_text() as well.
3) A related issue turned out, when prog->match_text is actually empty.
In that case we should try to find the next match and skip this
condition.
4) When comparing characters using collections, we must also apply case
folding to each character in the collection and not just to the
current character from the search string. This doesn't apply to the
NFA engine, because internally it converts collections to branches
[abc] -> a\|b\|c
fixes: vim/vim#14294
closes: vim/vim#14756
https://github.com/vim/vim/commit/22e8e12d9f5034e1984db0c567b281fda4de8dd7
N/A patches:
vim-patch:9.0.1771: regex: combining chars in collections not handled
vim-patch:9.0.1777: patch 9.0.1771 causes problems
Co-authored-by: Christian Brabandt <cb@256bit.org>
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Problem: calling `vim.filetype.match()` has performance bottleneck in
that it has to match a lot of Lua patterns against several versions of
input file name. This might be the problem if users need to call it
synchronously a lot of times.
Solution: add "parent pattern pre-matching" which can be used to quickly
reject several potential pattern matches at (usually rare) cost of
adding time for one extra Lua pattern match.
"Parent pattern" is a manually added/tracked grouping of filetype
patterns which should have two properties:
- Match at least the same set of strings as its filetype patterns.
But not too much more.
- Be fast to match.
For them to be effective, group should consist from at least three
filetype patterns.
Example: for a filetpye pattern ".*/etc/a2ps/.*%.cfg", both "/etc/"
and "%.cfg" are good parent patterns (prefer the one which can group
more filetype patterns).
After this commit, `vim.filetype.match()` on most inputs runs ~3.4
times faster (while some inputs may see less impact if they match
many parent patterns).
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Problem: Using xstrlcpy() when the exact length of the string to be
copied is known is not ideal because it requires adding 1 to
the length and an unnecessary strlen().
Solution: Add xmemcpyz() and use it in place of such xstrlcpy() calls.
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Problem: Patch 9.1.0296 causes too many issues
(Tony Mechelynck, chdiza, CI)
Solution: Back out the change for now
Revert "patch 9.1.0296: regexp: engines do not handle case-folding well"
This reverts commit 7a27c108e0509f3255ebdcb6558e896c223e4d23 it causes
issues with syntax highlighting and breaks the FreeBSD and MacOS CI. It
needs more work.
fixes: vim/vim#14487
https://github.com/vim/vim/commit/c97f4d61cde24030f2f7d2318e1b409a0ccc3e43
Co-authored-by: Christian Brabandt <cb@256bit.org>
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Problem: Regex engines do not handle case-folding well
Solution: Correctly calculate byte length of characters to skip
When the regexp engine compares two utf-8 codepoints case insensitively
it may match an adjacent character, because it assumes it can step over
as many bytes as the pattern contains.
This however is not necessarily true because of case-folding, a
multi-byte UTF-8 character can be considered equal to some single-byte
value.
Let's consider the pattern 'ſ' and the string 's'. When comparing and
ignoring case, the single character 's' matches, and since it matches
Vim will try to step over the match (by the amount of bytes of the
pattern), assuming that since it matches, the length of both strings is
the same.
However in that case, it should only step over the single byte
value 's' so by 1 byte and try to start matching after it again. So for the
backtracking engine we need to ensure:
- we try to match the correct length for the pattern and the text
- in case of a match, we step over it correctly
The same thing can happen for the NFA engine, when skipping to the next
character to test for a match. We are skipping over the regstart
pointer, however we do not consider the case that because of
case-folding we may need to adjust the number of bytes to skip over. So
this needs to be adjusted in find_match_text() as well.
A related issue turned out, when prog->match_text is actually empty. In
that case we should try to find the next match and skip this condition.
fixes: vim/vim#14294
closes: vim/vim#14433
https://github.com/vim/vim/commit/7a27c108e0509f3255ebdcb6558e896c223e4d23
Co-authored-by: Christian Brabandt <cb@256bit.org>
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Problem: too many STRLEN calls when getting a memline
Solution: Optimize calls to STRLEN(), add a few functions in memline.c
that return the byte length instead of relying on STRLEN()
(John Marriott)
closes: vim/vim#14052
https://github.com/vim/vim/commit/02d7a6c6cfceb3faf9c98fcb7c458760cd50d269
Cherry-pick line break changes from patch 8.1.0226.
Cherry-pick ml_line_len from patch 8.1.0579.
Cherry-pick test_comments.vim change from patch 9.1.0153.
Co-authored-by: John Marriott <basilisk@internode.on.net>
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(#27636)
Problem: <Del> in cmdline mode doesn't delete composing chars
Solution: Use mb_head_off() and mb_ptr2len() (zeertzjq)
closes: vim/vim#14095
https://github.com/vim/vim/commit/ff2b79d23956263ab0120623c37e0b4498be01db
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Problems:
- Illegal bytes after valid UTF-8 char cause utf_cp_*_off() to fail.
- When stream isn't NUL-terminated, utf_cp_*_off() may go over the end.
Solution: Don't go over end of the char of end of the string.
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